I have a set of functions that need a map of historic data.  Hence, this 
map gets passed along from function to function, usually several levels 
deep. In addition to the map, a reference date also frequently get passed 
along in 80% of the API.  Sometimes a third or fouth parameter is also 
passed along several layer in addition to function specific parameters. You 
got the idea. In OOP, these common function parameters usually are part of 
the object's attributes. In FP, I've seen them passed along individually or 
packaged up into a map or vector so that they are easy to pass along... 
sort of like a context object getting passed around.

What's the Clojure's way or FP way to improve this without having 5+ 
parameters in almost every function?

Thanks
Chris


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